package com.smart.util;

import java.io.File;
import java.util.Date;
import java.util.List;
import java.util.ArrayList;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.ss.util.CellRangeAddress;

/**
 * @Author yin_q
 * @Date 2019/3/22 9:50
 * @Email yin_qingqin@163.com
 * @Description 导出excel
 **/
public class ExportExcelUtil1 {

    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName ;
    // 文件存储地址
    private String filePath;

    private List<Object[]> dataList = new ArrayList<Object[]>();

    HttpServletResponse response;
    public String fileName;

    //构造方法，传入要导出的数据
    public ExportExcelUtil1(String title, String[] rowName, List<Object[]>  dataList, String filePath , HttpServletResponse response){
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
        this.filePath = filePath;
        this.response=response;
    }

    /**
     * 导出数据-文件地址
     **/
    public String export() throws Exception{
        try{
            HSSFWorkbook workbook = new HSSFWorkbook();						// 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);		 			// 创建工作表

            // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTiltle = rowm.createCell(0);

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);					//单元格样式对象

            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1)));
            cellTiltle.setCellStyle(columnTopStyle);
            cellTiltle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(2);				// 在索引2的位置创建行(最顶端的行开始的第二行)

            // 将列头设置到sheet的单元格中
            for(int n=0;n<columnNum;n++){
                HSSFCell  cellRowName = rowRowName.createCell(n);				//创建列头对应个数的单元格
                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);				//设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);									//设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);						//设置列头单元格样式
            }

            //将查询出的数据设置到sheet对应的单元格中
            for(int i=0;i<dataList.size();i++){

                Object[] obj = dataList.get(i);//遍历每个对象
                HSSFRow row = sheet.createRow(i+3);//创建所需的行数

                for(int j=0; j<obj.length; j++){
                    HSSFCell  cell = null;   //设置单元格的数据类型
                    if(j == 0){
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i+1);
                    }else{
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
                        if(!"".equals(obj[j]) && obj[j] != null){
                            cell.setCellValue(obj[j].toString());						//设置单元格的值
                        } else {
                            cell.setCellValue("");
                        }
                    }
                    cell.setCellStyle(style);									//设置单元格样式
                }
            }
            //让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    //当前行未被使用过
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                            if(currentCell.getRichStringCellValue() != null){
                                int length = currentCell.getStringCellValue().getBytes().length;
                                if (columnWidth < length) {
                                    columnWidth = length;
                                }
                            }
                        }
                    }
                }
                if(colNum == 0){
                    sheet.setColumnWidth(colNum, (columnWidth-2) * 256);
                }else{
                    sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
                }
            }

            if(workbook !=null){
                fileName = title +new SimpleDateFormat("yyyyMMdd-HH-mm-ss").format(new Date())+".xls";
                String fileTime =new SimpleDateFormat("yyyyMMdd").format(new Date()) ;
                File dest = new File(filePath+fileTime+File.separator + fileName);

                if (!dest.getParentFile().exists()) {
                    dest.getParentFile().mkdirs();
                }

                // 设置头信息
                response.setCharacterEncoding("UTF-8");
                response.setContentType("application/vnd.ms-excel");
                try {
                    response.setHeader("Content-Disposition", "attachment;fileName=" + new String(fileName.getBytes("UTF-8"), "ISO8859-1"));
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                //FileOutputStream fout = new FileOutputStream(filePath+fileTime+File.separator+fileName);
                System.out.println(filePath+fileTime+File.separator+fileName);
                OutputStream outputStream = response.getOutputStream();
                workbook.write(outputStream);
                outputStream.flush();
                outputStream.close();
                workbook.close();
                return fileName;
            }

        }catch(Exception e){
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 列头单元格样式
     **/
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {

        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short)11);
        //字体加粗
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        return style;

    }

    /**
     * 列数据信息单元格样式
     **/
    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        //font.setFontHeightInPoints((short)10);
        //字体加粗
        //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        return style;
    }

}